The lightpaths within a wavelength switched optical network (WSON) are usually bi-directional, with a same
route and a same wavelength which are allocated for both directions from the viewpoint of optical network
operation. On the other hand, the introduction of generalized multi-protocol label switching (GMPLS) as a
network control plane is expected to bring more intelligence and to provision the end-to-end lightpath in a
cost-efficient manner. In this paper, we experimentally demonstrate and evaluate dynamic provisioning of bidirectional
lightpaths in GMPLS controlled optical networks, considering the wavelength continuity constraint
and the physical impairment constraint on both directions.
In this paper we review our previously-proposed direct-detection optical OFDM
superchannel and the corresponding optical-multiband receiving. With this technique we have
successfully demonstrated the transmissions of 720- and 1200-km SSMF, respectively, at 214- and
117-Gb/s data rates.
We demonstrate an optical transmission system based on a 6-level PSK modulation format and differential detection
with a partial symbol delay. The 6-level PSK signal is simply generated by using a chirp-free Mach-Zehnder modulator
followed by a phase modulator. In order to convert the phase information of the 6-level PSK signal into the intensity, we
utilize a pair of two Mach-Zehnder delay-line interferometers with having a differential delay less than the symbol
duration of the signal unlike a conventional differential detection scheme. We evaluate the performances of the
differential 6-level PSK signal and compare them with that of a conventional DQPSK signal. In addition, the
transmission performance of the 21.4-Gb/s 6-level PSK signal is experimentally verified in a 240-km long dispersionmanaged
fiber link. Furthermore, additional simulation results show that the tolerance to optical filtering and chromatic
dispersion of the 107-Gb/s differential 6-level PSK signal is improved significantly by adopting the partial demodulation
scheme.
KEYWORDS: Network architectures, Switching, Web services, Ions, Interfaces, Optical testing, Switches, Communication and information technologies, Optical circuits, Circuit switching
To provide end-to-end wide-bandwidth data transfer over lambda and Ethernet networks, we demonstrate dynamic
circuit provisioning by web services interface proxy which enables interoperability among different network
provisioning systems.
In this paper, WDM transmission experiments are discussed showing simultaneous compensation of
nonlinear effects and chromatic dispersion through optical phase conjugation (OPC). The performance of
OPC and DCF for chromatic dispersion compensation are compared in a wavelength division multiplexed
(WDM) transmission link with 50-GHz spaced 42.8-Gb/s RZ-DQPSK modulated channels. The feasible
transmission distance for a Q-factor ~10 dB is limited to approximately 5,000 km and 3,000 km for the OPC
and the DCF based configuration, respectively. When the Q-factor as a function of the transmission distance
is observed, at shorter distances, the Q-factor of the OPC based configuration is about 1.5 dB higher than
that of the DCF based transmission system. Up to 2,500-km transmission a linear decrease in Q is observed
for both configurations. After 2,500-km transmission, the Q-factor of the DCF based configuration deviates
from the linear decrease whereas the OPC based performance is virtually unaffected.
The optimum signal format and the optimum FEC code rate for 40 Gbit/s-based WDM systems have been studied experimentally and numerically. We found that the bandlimited CS-RZ with highly efficient FEC of between 80 % and 90 % code rates is expected to be a suitable solution for ultralarge-capacity long-haul 40 Gbit/s WDM systems.
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